diff options
Diffstat (limited to 'net/wireless/core.c')
| -rw-r--r-- | net/wireless/core.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/net/wireless/core.c b/net/wireless/core.c index fe01de29bfe8..bbf1fa11107a 100644 --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -46,6 +46,11 @@ static struct dentry *ieee80211_debugfs_dir; /* for the cleanup, scan and event works */ struct workqueue_struct *cfg80211_wq; +static bool cfg80211_disable_40mhz_24ghz; +module_param(cfg80211_disable_40mhz_24ghz, bool, 0644); +MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz, + "Disable 40MHz support in the 2.4GHz band"); + /* requires cfg80211_mutex to be held! */ struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) { @@ -451,6 +456,18 @@ int wiphy_register(struct wiphy *wiphy) return -EINVAL; /* + * Since cfg80211_disable_40mhz_24ghz is global, we can + * modify the sband's ht data even if the driver uses a + * global structure for that. + */ + if (cfg80211_disable_40mhz_24ghz && + band == IEEE80211_BAND_2GHZ && + sband->ht_cap.ht_supported) { + sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; + sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; + } + + /* * Since we use a u32 for rate bitmaps in * ieee80211_get_response_rate, we cannot * have more than 32 legacy rates. |